Anderson has conducted extensive research on the topic. He said the more children play violent video games, the more apt they are to become violent in the long run.

"They are more likely to get into fights in school. They are more likely to do a number of kinds of aggressive behaviors," said Anderson.

Anderson said that while playing violent video games probably contributed to the Connecticut shooting, it takes several other risk factors such as antisocial behavior or a violent background for a person to commit a mass shooting.

"When you have multiple things coming together at once then the probability starts to go up," said Anderson.

Anderson said parents should teach their children that even though it's sometimes glorified in the media, violence is not the answer to life's problems.

"Lots and lots of parents don't have those kinds of conversations with their kids," said Anderson.

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